A collection of diagrams that TRY to illustrate the range of Social Media, Web 2.0, and related applications. I compiled this to show a client that "Social Media" (or So-Me as I often call it) is much more than just Twitter and Facebook.
But warning: 1) they're geeky, 2) they're mind-bending in their complexity, and 3) are only somewhat successful...
I particularly like the Brian Solis Conversation Prism and the Robert Scoble Starfish, while ugly, is a classic.
The last two are just for fun.